Born-Haber Cycles

Question 1

How would you calculate lattice enthalpy using a born-haber cycle?

Answer 1

1. Construct the cycle
2. Complete missing equations
3. Assign each stage a letter and find the value of enthalpy in the table
4. Make each route equal to the other to calculate lattice enthalpy

Question 2

Why do diatomic elements have 2 atomisation enthalpies and 2 electron affinity enthalpies?

Answer 2

• the diatomic element is split into 2 moles of gaseous atoms so also forms 2 moles of 1- ions